stern.de

Checked 22 October 2026, 00:30 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 3 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

info

ns-1307.awsdns-35.org, ns-1657.awsdns-15.co.uk, ns-54.awsdns-06.com, ns-851.awsdns-42.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-1307.awsdns-35.org, ns-1657.awsdns-15.co.uk, ns-54.awsdns-06.com, ns-851.awsdns-42.net
NS in the zone
ns-1307.awsdns-35.org, ns-1657.awsdns-15.co.uk, ns-54.awsdns-06.com, ns-851.awsdns-42.net
NameserverAddressesNetwork (AS)Glue
ns-1307.awsdns-35.org205.251.197.27 2600:9000:5305:1b00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1657.awsdns-15.co.uk205.251.198.121 2600:9000:5306:7900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-54.awsdns-06.com205.251.192.54 2600:9000:5300:3600::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-851.awsdns-42.net205.251.195.83 2600:9000:5303:5300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1307.awsdns-35.org, ns-1657.awsdns-15.co.uk, ns-54.awsdns-06.com, ns-851.awsdns-42.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1307.awsdns-35.org 205.251.197.27NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1307.awsdns-35.org 2600:9000:5305:1b00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1657.awsdns-15.co.uk 205.251.198.121NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1657.awsdns-15.co.uk 2600:9000:5306:7900::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-54.awsdns-06.com 205.251.192.54NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-54.awsdns-06.com 2600:9000:5300:3600::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-851.awsdns-42.net 205.251.195.83NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-851.awsdns-42.net 2600:9000:5303:5300::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1 · primary ns-54.awsdns-06.com

Found

Primary (MNAME)
ns-54.awsdns-06.com
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1307.awsdns-35.org (205.251.197.27)1
ns-1307.awsdns-35.org (2600:9000:5305:1b00::1)1
ns-1657.awsdns-15.co.uk (205.251.198.121)1
ns-1657.awsdns-15.co.uk (2600:9000:5306:7900::1)1
ns-54.awsdns-06.com (205.251.192.54)1
ns-54.awsdns-06.com (2600:9000:5300:3600::1)1
ns-851.awsdns-42.net (205.251.195.83)1
ns-851.awsdns-42.net (2600:9000:5303:5300::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-54.awsdns-06.com is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

36 records at the apex

Found

Read from
205.251.197.27:53
TypeValueTTL
SOAns-54.awsdns-06.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1307.awsdns-35.org.172800
NSns-1657.awsdns-15.co.uk.172800
NSns-54.awsdns-06.com.172800
NSns-851.awsdns-42.net.172800
A207.174.61.13600
MX10 assur.rtl.de.3600
MX10 marduk.rtl.de.3600
MX20 sul.rtl.de.3600
MX20 sulis.rtl.de.3600
TXT"MS=ms57707376"3600
TXT"Sendinblue-code:6ef1bdca0140128a0b0cdffd769c529f"3600
TXT"_upfglwpdo67m8isvjzg7ryqxs37tovv"3600
TXT"adobe-idp-site-verification=6afb72c9c82f99bfe04f0d867f1ee4d51df22e914fd17ab2966ef833e033c331"3600
TXT"adobe-idp-site-verification=d0c425a4-3baf-4f0f-839a-77405c026049"3600
TXT"atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O571fgiIg//j5Hn"3600
TXT"facebook-domain-verification=anro1ovcjkyxqwimh0lq7eboulo46b"3600
TXT"facebook-domain-verification=qqqa5t9rcj1082aritwg35kos5q4y2"3600
TXT"google-site-verification=0LPqW3ngi7NOIsUfsmXm5827TOvKfh_OVQ8wsBtI3Wo"3600
TXT"google-site-verification=MHlhpAUy-2_lW67H5knj8VG2ksH0Eyp7AcGdlmF2c8I"3600
TXT"knowbe4-site-verification=9f84b0069b8711b7d78efc51717ae64a"3600
TXT"miro-verification=cb749e1ffbea1463e5ad819295f54687fc362039"3600
TXT"openai-domain-verification=dv-QN1ODCclbeEju8zYIzaldJDl"3600
TXT"sNWN5aM0BTtlJt2jsPBX4+s5RY6pSJ7btNFaE+Sjo7bSd7uz54PrlpCeuhco/h/NxJiH/WdhHSKmyZzgOW96Qw=="3600
TXT"tollbit-domain-verification=066bc572e718d1f3164fca3c87c0f946139d595b3606936c92c08153be93f3d4"3600
TXT"v=spf1 ip4:194.12.192.0/19 ip4:193.16.163.16 ip4:193.16.163.17 ip4:62.225.111.138 ip4:89.1.8.0/23 " "include:_spf.kundenserver.de include:spf.protection.outlook.com include:amazonses.com include:spf1.checkinserver.com include:spf.sendinblue.com include:_spf.zimpel.de ~all"3600
CAA0 issue "amazon.com"3600
CAA0 issue "digicert.com"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issue "sectigo.com"3600
CAA0 issuewild "amazon.com"3600
CAA0 issuewild "digicert.com"3600
CAA0 issuewild "letsencrypt.org"3600
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"3600
CAA0 issuewild "sectigo.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: amazon.com, digicert.com, letsencrypt.org, pki.goog, sectigo.com.